Who is Al-Qaeda's New Leader Ayman al-Zawahri and Why is the US Pounding Yemen with Drone Strikes?

Ayman al-Zawahri is Al-Qaeda's new leader. How is he compared to Bin Laden and what was his role in Al-Qaeda before getting to the top of this terrorist group. Plus why is the US is intensifying its drone campaign in Yemen. This CBN segment gives us the answers.